Wireless shows up on one computer but not other!!

I have a MacBook Pro and for some reason no wireless networks show up. My roomate has a MacBook and the wireless shows up on that computer. Both computers can be in the same location and for some reason the internet will just now show up on my MacBook Pro!!! Please helppp this is very irritating!

Do you have Airport status icon in your menu bar? Is it on or off? Go to Sys Prefs > Network and authenticate ‑‑ what does it say about the status of Airport? Is it off or on? If on, click on Advanced. Under Airport tab, click on "+". Can you add a network? If not, go into Sys Profiler ( > about this mac > more info > Network > Airport Card. What does it say? "No information found" or does it give you info about your Airport Extreme card?

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